Question about Insignia NS-LCD37 37 in. LCD TV
As in the first place I thin when the set was opened for solving the sound problem and reassembled the whole set worked with a difference.
To me it looks as though you need to recheck and redo the first job once again . Please have the power lines taken off and the charge in the main power supply section discharged.
Now look at all the connectors , the drivers, the possible heating areas. there is a high possibility that bad connections , loose connections or DRY solder joints are a possible issue. Use a good light to look into the circuits and the connections. Unless you can probe with a voltage /signal test, replacement of the whole board is not a solution as to the cost.
Since you have the two boards a cross check on the components can be done. Please check power to the processor section, check the oscillations on the crystal to confirm the working of the processor, and finally the drivers of the different stages.
Posted on Mar 19, 2011
Hi,i think it's a Good idea.It's not worth all the stress your Going through..
Since it's on warranted,it's advice able to take it back for replacement..
Posted on Mar 18, 2011
From your brief description I understands that, you have replaced the main board. It was working fine until last week too you reports. And the sound has gone off, and picture was there. I thinks that you have some technical skill and knoledge in eletronics, utherwise you can't do this. but after replacing the main board, for every LCD tv will need a firmwere update. You havent reporte about it, whether you have done it or not. anyway, this time, its power inverter board has the trouble. it is very difficult to descirbe all the details here, and as you know, there is no one sentence answer to any electronic device problems. have you its schematic diagram with you? In it, the company have described all the details, and can be get from electronic sparepart shops in book form. If you face any difficulty in getting the service manual of Insiginia, send a amil to me, and I'll send the service manual to you by return mail. i can't send it to you by this site, as the file is too large.
Anyway, check its power inverter board. it has the problem now. OK
Posted on Mar 18, 2011
There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
If you repeatedly turn it on, eventually it'll probably stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for 5 mins, then try.
If you aren't tech savvy, this unit needs to go in for repair.
If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).
Most of the caps that go are 10V 1000uF or 3300uF.
I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.
Posted on Mar 17, 2011
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Posted on Jan 02, 2017
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